On both swing-1.0/JDK1.1.6, JDK1.2beta3-J. Tested Solaris 2.5.1, ja locale.

STEPS:
1. extract attached "packages.html"
This html is from JDK1.1.1 ja supplement. Alternatively, you can get it from JDK download page.
2. run SwingSet as follows
$ java SwingSet some/directory/packages.html
3. JEditPane reports as follows, line 12 is the first line that contains Japanese character.

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com.sun.java.swing.text.html.TokenMgrError: Lexical error at line 12, column 48. Encountered: "%" (37), after : ""
        at com.sun.java.swing.text.html.html32TokenManager.getNextToken(html32TokenManager.java:2037)
        at com.sun.java.swing.text.html.html32.jj_scan_token(html32.java:6208)
        at com.sun.java.swing.text.html.html32.jj_3R_68(html32.java:4596)
        at com.sun.java.swing.text.html.html32.jj_3_17(html32.java:4968)
        at com.sun.java.swing.text.html.html32.jj_3R_88(html32.java:4976)
        at com.sun.java.swing.text.html.html32.jj_3_37(html32.java:4628)
        at com.sun.java.swing.text.html.html32.jj_3R_89(html32.java:4636)
        at com.sun.java.swing.text.html.html32.jj_3_68(html32.java:5960)
        at com.sun.java.swing.text.html.html32.jj_2_68(html32.java:4257)
        at com.sun.java.swing.text.html.html32.a(html32.java:1883)
        at com.sun.java.swing.text.html.html32.Especial(html32.java:295)
        at com.sun.java.swing.text.html.html32.Etext(html32.java:382)
        at com.sun.java.swing.text.html.html32.pre(html32.java:2492)
        at com.sun.java.swing.text.html.html32.Epreformatted(html32.java:175)
        at com.sun.java.swing.text.html.html32.Eblock(html32.java:1393)
        at com.sun.java.swing.text.html.html32.Ebody_content(html32.java:1488)
        at com.sun.java.swing.text.html.html32.body(html32.java:1604)
        at com.sun.java.swing.text.html.html32.html(html32.java:3766)
        at com.sun.java.swing.text.html.HTMLDocument$HTMLReader.read(HTMLDocument.java:229)
        at com.sun.java.swing.text.html.HTMLDocument.read(HTMLDocument.java:140)
        at com.sun.java.swing.text.html.HTMLEditorKit.read(HTMLEditorKit.java:112)
        at com.sun.java.swing.text.DefaultEditorKit.read(DefaultEditorKit.java:120)
        at com.sun.java.swing.JEditorPane.setPage(JEditorPane.java:151)
        at com.sun.java.swing.JEditorPane.<init>(JEditorPane.java:78)
        at HtmlPanel.<init>(HtmlPanel.java:51)
        at SwingSet.<init>(SwingSet.java:367)
        at SwingSet.<init>(SwingSet.java:186)
        at SwingSet.main(SwingSet.java:1268)
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koushi.takahashi@japan 1998-03-04